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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '83ceb7500018e6c4589ab1f94638c213d9c4b6704a9a98aed21164dc1e1fe555' 
  AND token = '81enhzH/X/2MYPc7tWUn4kzGRdN7yy55xM2vN4HiKX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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