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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62b7cdd6ff41362c591cc2847be4b35da3c6b6ef26092b461c3d880d46cca062' 
  AND token = 'ywUyIAcql15NJIcLCzL3ldf7dPEN6fTfsl/j5oitCDc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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