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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '292c42ec52f884664473c8c236c4970975c944b84a9df77a1c446d165d9f2680' 
  AND token = 'DtM5FdU9awAIxPNg/9ffDjG7z+YJnrPwVaITR9myL7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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