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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b263d7c3240ffea0310843ce84d526ff2f58fa6b3b686d72c046910720351da' 
  AND token = 'yLJ/MgeN7CdPr/mddB2ZlSabm0ZWL0oyudsWrLFq/TA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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