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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f8d1e828167f24f5a35ea94fd02399064a874b92c7a8a3fee61cfcb3054549' 
  AND token = '8kC2T8bn547RjIL23QY06BYVW/gnU4ZF8VNCslxz7hU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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