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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bf4e465a1c98bb0b3bfe3223f65daf5a25afce44f129644a5ed16cb730412e97' 
  AND token = 'ipsAYGhXX1QVs8z0wervMK438KeGWF9xb5aw1ej+7tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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