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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64cdfd253a979221dd5892d4e179881761e91891568bd9fe57b7b2e65e423ce' 
  AND token = '+bYzffDOSQqdJhd5luH2ZpLwArWaUq+gubpTxdmebjA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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