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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ab1485372c93a1c1f5b65b0642b34ef3c4cded1adc1a9179388aa33f5bef77f' 
  AND token = '+zMcRUlB6ak8/TD40M1/44Tab3l90vQHVSMp/Bbmw14=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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