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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '136df96cd0cd56b4310c976892821ee0099c2ed596b6e6cc26c51cd7087a0b79' 
  AND token = 'bAB64G1BTfUfwPw4fMZujoKS90FgZlgqrS7sT6b081k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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