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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b587a0d070a57f21a4186d332f2a86962b0526bf037840e63b06a300b7c06db2' 
  AND token = 'uT4WvmbHz9cjnXUFM7LiS2CFQaPTTzRdfWIBcvdMQKw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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