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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63dd026679c6c24c10314fe4fc0b1eb0e2f8bbf814228629770a0d8529734a78' 
  AND token = '39q7GgNZiM9e4X98Z/uqmKkp16BME0xjOAwWC2LmQVk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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