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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54e1059ed597a045676dadbdd5d4cd2d4e85641fcc6006a477f258a3b7696734' 
  AND token = 'wuNTjJ3oJeQxpU5GJOCY2SFTFgKW1p/ySkqs6n4iMzA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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