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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'edabc26db9bc86d19a3322642b2956cec538d8a2bfb0779361814bc67d06bc1a' 
  AND token = 'cxG9X7/ig+tf2VM5RaAim9y3lBa2+/+q6ckpiqTDcxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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