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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c46be1c646adf83acc4c0c53d55c12c9b6c99b25e50d03dd135508e0fefdfc' 
  AND token = 'sliNPlkwThGsNG5p6fsl0G7BJI0Y+Syu+AYgJpaIM14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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