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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '777c3266cec8a65cfc92d5cf6261d6b61b851a485c1713da65043dfc8d505adc' 
  AND token = 'YxU9Xf7wyg1Vl8UMVoFSIHSWQAQ8iBHZ/lkoSmOjqbA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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