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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e0b0203cb62f18f243856270df6f6567e802c66c4f4a692076d6f8eccbb012ed' 
  AND token = 'geFmnSs0PMIESPlsHiIULbhkJz2ZYJZT21v7Oy6qdZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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