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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7883c4d28d80cbcd8a02de7dd651c86e7d8a03a4eece412deb8659c827d1aa6d' 
  AND token = 'PB9OJUyBYYw9A+m/Gca/9yJhDpWMXSxryLIVKXKrR0c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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