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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cd1eaefc5a71b11a958c5a508ce21b6be38065d224e866462aac5acad887a93' 
  AND token = 'jJaKfaC2M20J+0Z3gHNMLzWl1AV0F3ROf5kOR2pU4nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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