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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '35ad58ed45d8ab76ea10e67edeca6f2a21fb806c0c1defa22c8faa2572cd3ea6' 
  AND token = 'gSN54TzYvISudsGVnyRNzk66sb+cHWobgG6UZWxyCG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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