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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a73cb80418ef161dc569d7dbff454d15e74d91f74cabc2e4321a57d4e8fca30e' 
  AND token = 'BISjiSR4fY7uZyHNYMkl+z88QBgyl9U/sRfr27oWd0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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