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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1028279cfeb0a98700377393d923ff71aba70b8a53481cdc8257b7510583c113' 
  AND token = 'sD2HlLpyvYT8/mbRo+VCDRm6FKFRf39Hfz2q6p/6rHo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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