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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abee75f9f9755ccdc5e02458e921f187068a3f3702f2a7fae4486aa9e05e3e12' 
  AND token = 'niYKEFmhpCev1Xk9QpF74II4pjhLTLkqUglQQMkIxQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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