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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f57fd32d3db2739493b42e189636d7bf54686c14c3e004de2956c979d00eaf1b' 
  AND token = 'CX3e4FnQLEReBzZB8py6J8bbuZ0mJou3z1713IHXb+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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