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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19659695fe9261fbcb1c653d64219172427e8cd2edfb5072a7b77f8daa8a9f0a' 
  AND token = '/h2b19GHanP4z2Zjrs/mhhsIwZ+JZY1fn1072nUnjxU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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