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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960481443e80d71bab3ff7006ef1baa3b3c847ec71b21c6a568e1d5c9f32b422' 
  AND token = 'LhdGsZNw4k6MjKAhrxGITeDio4im+Ws2xDiaZ42RGqk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}