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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eebb1ced5d903657bc183992f2becfc8459a847a17b38c6ca858d1c5b77ec2d4' 
  AND token = 'Q/UKtQTFo9lY0Mot4wAI8vL5LGQdT25hCoZcAFxIYlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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