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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55743515d1f2752353581b6a2ab0fb2a9d7777f748c2fde16581fd763003d22e' 
  AND token = '1YgcTk+vRqP7lMyvg0PV7RXKVbIFSpPEXFjW2G7o8G8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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