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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aaa7f4b08b565fc31c2384745a786ee9bae6ff09ca16597d45d217b6c345a097' 
  AND token = 'wsnztTNFeoe/8SwbSFyzOqPaGM3d2lq6C/rxxP1Cqo8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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