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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74bf9c961769df86bf04c0893c931a3a8185ee232b2b52db62714b426534c116' 
  AND token = '1TsJZNZw5z/kQtJysYM0ri560PR4p5yTDtRXJetwBVU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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