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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4011ea165fb82c25c901a67500a19f9c7164d45161a70475448da8466305b8bb' 
  AND token = 'B/0VIsgnYbR1TvchxmKIDMfevSztUQ5mr+yBaFb6kg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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