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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc2c13eab3299de316dba5d69ac8a7636c2e1efdeba74242160e83ae82bd8c62' 
  AND token = '+yPaOL/A+WaMpBDyc8l3vm4tX0iOR7BM8RQyCfSNtLY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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