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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '554cf3306b7631e74a97f4bb1109ff1be2c2d64c8d976ac4f8de29722fba0f88' 
  AND token = 'FybG8bmG65xa01f7kNcj8H+cpoRuEwnpEHusMfi9IBY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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