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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'af086ed4629bd84106a7a437a22634e783b9ba0fa30744eed40c439aefc2e79b' 
  AND token = '578mWEJRQl2tX13q4MWZfTXTAaJIyXXSIGUJ4yb8aQk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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