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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c842e20ad66a81e082dfeab9545aaa36dfb99c2573761bf9e47bb14bfbbd081f' 
  AND token = 'n+B8m9XuGzgW6MC3aCAJ4FRfPMpHB5YBLfcm3S6EfYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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