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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02dbe30be42e2c1c5e7e48d4f44edfccea06ec194888ffc79f334754f5d52e3a' 
  AND token = 'FZ1VplxqR8zbAs6OMbDj2O0xvj5w9XqAdwUeDkpUljQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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