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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e6bd89a14cb51ff07e09b5f4400db846e7853f9b561af8bc1ec9ccf985d0e6b2' 
  AND token = 'n9pm79WjAlnDBooa0lfTLDIjmeGwVy1q+Qk+96rysiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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