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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e73ffdfec8512722e0cd44aabea872791381d2e0955e109fce6ef7a91c39dc57' 
  AND token = 'hTE3e5077QjMNUhtLxwf6JTCUPZtuuUOpxC5tf2ZqHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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