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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b7a30c06e3de0c39ee232dc4d0d2a40380b36fa84e75fc81db013b9fef4b5a4' 
  AND token = '8nbjIi0n3dzheaoX3FsQfseX3ouAlMLbTZ+BH0Dipmk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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