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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '960537b6a8068fe082181f986e717d0355ab920482fe327201960c852b2bacc5' 
  AND token = 'Z5l1ZB7Uo22txvaGkI3A+eu2eC4+V1u554W5r1tyovU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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