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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57d76b0f0bf1c6e760be0957dbb3e10ed6828456ebac31d27aded3beffd353e1' 
  AND token = 'H8K5hrZ9c7oVG52ga2lIx8QsywZ4h5hmemf6UpMTjdM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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