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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8d0ad8350cfe7944681e5e1c2eceb15ba058a0705285f4d35d12338874566f0' 
  AND token = 'q8MpVTSY/ueGy48zz+REHHjifgiosVKMMJdaja43pAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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