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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'de21c4adc13d8f3402ae281bc435ebd9c6759323138b6da79c7504764e669898' 
  AND token = 'wR4pFbLshdVaLokVUGzWCxYN0iHHWtWCzIaxrpeeets=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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