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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3d18ed2662bde889bdd6479b7195a7767650b509624aedca5d05849d587727b9' 
  AND token = 'bkfahiEqHlGFJfFyL6zfM7igSY1ucfPnTAIchP/MRkI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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