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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3fe7a4a52ca73a7c67c4c197b51f7797f9d72ed27d7c570157ee847443149817' 
  AND token = '7/9wp0vBoWB0lpwHFqcvLghH+SU2omJH6Qge0WhWS1c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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