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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cee7d69db384123674a3c29f9a87fb3bfea5dd297f15098e0234bfc76e90ee02' 
  AND token = 'W1WI4X+pY9Y9FCzSZ4m/s1VS3rM+6tHdmgvtxYFtksg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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