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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '094fa5bbee3fa4210a171c2ab3a3a150370e0030adac9b4f9752a582ef1561c2' 
  AND token = 'z7B1OuAz0wBRxQx3b0ZmlimRP/JTlf5L8iv7LyufT68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00063

JSON explain

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