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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1830afb2d00abbe46e53e8d18b1deadefae8a6c99ff0bca068b32e014549860b' 
  AND token = 'ClbqSsgU6qmlueVUIIFeCOJTYps/v2t0dLXk2LPikIE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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