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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '77cc0a675ea083889ab5ea62e37a8dd1ddad2745aebe48ecd2d24c7ef2a65ca1' 
  AND token = 'USjUuyjB2DWBfX4LavIcU40Vlkj8QnyeYsZvlca2+F4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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