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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a8a2f611b0a6e5719354d65083a96803d0e01c7c0f7a9777b7aca0bdc747e434' 
  AND token = '07HJDbrKjLvj0u6KzD2TI3hjsLs94BF6UeWOgZlrbQQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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