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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e03ca57563a5f7d97bc89574c120dacadb5a650be9fb2f236bb10b5757c4b5b3' 
  AND token = 'yPyOj44eGL/J3RtMg23RtH2qaaSFmwI8JlK4xgFTVGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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