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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0be5443acc29983f5a59c5515670e43b82bfd621826e4daa6b5aeef0f05da3ab' 
  AND token = 'AB7Od+k9FrpZPa1qZGj6muC1122dw0dBx21s9fzrYPQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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