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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8788b04a6a3a58514d02ccb7bba09c7af71d7fee4fe664eef39100425ce6dd14' 
  AND token = 'm+94qIpUVG9ubpvIUV9X5Lrbv8spv3do+6VXJci5Vac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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