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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d4db3d0635c07d55ac10989a9eb979e2f8df61e70e44d8e50ebbf73467f1466' 
  AND token = 'h/MPwQZ2JJ5ySQUm7aHWHbw9omUF9zE6iR1SnP8Ft28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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