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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a3159e2d7096e4836e739f7ede246dce7e6daff5729a4aa631aeb8df2c0226' 
  AND token = 'aCEqSIsK73sb+MxARpS6ekGK3swxWyMF69rTFvtdMkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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