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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '037cd95b00f0658ca040696c9f6d3990e4edb4f4779876bb235b4ff7343f5520' 
  AND token = 'ERa99RV1Mm9/NOWsMPJgw0kG6KOwtuHTk7f8NBg4a3o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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