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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '37b7db361d6c1d419ce81dcdd66ec0283e1332ad816b47e5d1bbfab72770cec0' 
  AND token = 'bBWk/IE4rpSsb601tGshpU1oAbdbXBVXQy89VV3ewBo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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