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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dd647d8607d07f7e068e8c62875d9bb70d6ffcbfa5e89435179f5ce4bb90476' 
  AND token = 'Iy0Af4LcuTTin7jUrzuj44nvY0/oWs2jEKO8gD5tYWs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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