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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '501264bbc2ebd14522fbe4992ddf5c7b742f64d5e35aba93717703b2fb352b2f' 
  AND token = 'b3p5Z9kz4X+g0wwKYj13oHWUbyqCIUWuoF+7U01pvyc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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