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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd84ca9df0d4a7800e0361a5216b816120a444cdfdb9aecf9b35b2b00f7c6f602' 
  AND token = 'NaI0UA74vpjQtboelWTLTULRi8hubz2ouq0XrEqUWvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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