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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fce7b670a905e687a7762c9c267b34ff902d1861da0a334007da0c57f3836e9d' 
  AND token = 'Jrk9GLT7PdEk5v0ePpGQ89Mt8WxhJFM52eOOUHDw8WM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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