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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '19a42f7e8050cf029492c0b5ddaea842c32ca443386c3cd30f8dc32c81c03297' 
  AND token = 'PCU5CYHaPG/PgUkU8qlUxWPWaeZQ6J+/GndYZkhR+KM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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