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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f2f579d05dcba66bf4c9d098bd76db5b6a8458a9cb5f4f78320a092ab65703a' 
  AND token = 'yKTmHOZ2GYEpPT/m5sLpWlMN4519X9GGOAFZALSqAuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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